Consider the following distribution :
Marks obtained Number of students
More than or equal to 0 63
More than or equal to 10 58
More than or equal to 20 55
More than or equal to 30 51
More than or equal to 40 48
More than or equal to 50 42
the frequency of the class 30-40 is
(A) 3 (B) 4 (C) 48 (D) 51
The times, in seconds, taken by 150 atheletes to run a 110 m hurdle race are tabulated below :
The number of atheletes who completed the race in less then 14.6 seconds is :
(A) 11 (B) 71 (C) 82 (D) 130
Consider the data :
The difference of the upper limit of the median class and the lower limit of the modal class is
(A) 0 (B) 19 (C) 20 (D) 38
For the following distribution :
Marks Number of students
Below 10 3
Below 20 12
Below 30 27
Below 40 57
Below 50 75
Below 60 80
the modal class is
(A) 10-20 (B) 20-30 (C) 30-40 (D) 50-60
Consider the following frequency distribution :
The upper limit of the median class is
(A) 17 (B) 17.5 (C) 18 (D) 18.5
For the following distribution :
the sum of lower limits of the median class and modal class is
(A) 15 (B) 25 (C) 30 (D) 35
The abscissa of the point of intersection of the less than type and of the more than type cumulative frequency curves of a grouped data gives its
(A) mean (B) median (C) mode (D) all the three above
While computing mean of grouped data, we assume that the frequencies are
(A) evenly distributed over all the classes
(B) centred at the classmarks of the classes
(C) centred at the upper limits of the classes
(D) centred at the lower limits of the classes
A bag contains 3 red balls, 5 white balls and 7 black balls. What is the probability that a ball drawn from the bag at random will be neither red nor black?
(A) 1/5 (B)1/3 (C)7/15 (D) 8/15
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